IR Spectroscopy of the Most Distant QSOs

Details IR Spectroscopy of the Most Distant QSOs IR Spectroscopy of the Most Distant QSOs

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mas..conf...77m&link_type=abstract

MULTIWAVELENGTH AGN SURVEYS. Proceedings of the Guillermo Haro Conference 2003. Held 8-12 December 2003 in Cozumel, Mexico. Edit

Astronomy and Astrophysics

Astronomy

Scientific paper

We carried out IR spectrocopy for 22 QSOs with redshifts in the range 3.0 < z < 6.4 in order to investigate the iron abundance relative to α-elements by comparing the FeII UV bump (redshifted into the near-IR) it with the MgIIλ2798 flux. The uniform observational technique and the wide redshift range allow a study of the trend of the FeII/MgII ratio with redshift. We detected iron in all quasars including the highest redshift (z = 6.4) currently known. We found the FeII/MgII ratio is nearly constant at all redshifts, although there is a marginal evidence for a higher FeII/MgII ratio in the quasars at z ~ 6. In addition, 4 out of the 8 QSOs of the sample within the range 4.9 < z < 6.4, show prominent, blueshifted CIVλ1549 absorption, i.e. are identified as BAL quasars. The latter finding strongly suggests that the fraction of BALs at z~5-6 is higher than at lower redshift (z<4).

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